The 61C351 is an Input Module Analog Rail Card made by Reliance Electric. It may have also been produced as a part of the Asea Brown Boveri and/or Baldor Reliance lines depending on what dates it was in production. It has support for this item has been terminated by these companies and might be a little hard to find. AX Control does try to strive to keep it in stock, however, as a new surplus or refurbished part.
The 61C351 is a 0 to 10-volt Analog Rail I/O Module that was meant to be a part of an AutoMax DCS. This module is a stand-alone panel mount device that attaches to the panel using its backplate. You can attach 4 screws to the backplate for a very secure mount.
The 61C351 does have many elements on its faceplate. On the faceplate, there is a spot for a 250 type fuse and there is a label beside it that says to make use of a 75mA with a 24VDC and to use a 25mA with a 120 VAC. It has a mode switch that swaps the device from Rail to Local Head. It has 2 Input and 2 Output channels that are labeled 0-3. The inputs and outputs on those channels are in groups of 3 that are numerically labeled 1-12. Alongside the numerical labels are the phrases common or V-IN. The 3, 6, 9, and 12 input/outputs are not labeled in this way. There are two major indicators in this module. One is labeled pwr ok and the other is labeled com ok. There is a box that is labeled as input pwr. This label indicates that the DC- DC+ is 24 VDC and the L2 L1 is 120 VAC.